The actor is on life support while her family determines if she can be an organ donor.
The ex-wife of former US president Donald Trump has died, according to a family statement.
Police reportedly are investigating the circumstances around the actor's death.
Didion will long be remembered for her award-winning novels, memoirs and essays.
Valentine was an outspoken skeptic of coronavirus vaccines, saying he had a low risk of catching the virus. His message changed once he was hospitalized.
The controversial figure was one of the biggest names in adult entertainment.
The actor and comedian is known for her roles in The Mary Tyler Moore Show, The Last Picture Show and Young Frankenstein.
He was one of the greatest music producers of the 20th century, and one of its darkest men.
The two-time Oscar winner and "Gone with the Wind" star was also a vocal opponent of unfair labour laws and sexism in Hollywood.